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don’t render resources outside the view port when the render limit is about to be hit

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This commit is contained in:
Stefan Breunig 2013-02-25 08:17:10 +01:00
parent cac8d017f8
commit 67d4fbbe03
1 changed files with 11 additions and 4 deletions
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15
code/utils_misc.js
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@ -117,6 +117,7 @@ window.getPaddedBounds = function() {
window._storedPaddedBounds = null;
});
}
if(renderLimitReached(0.7)) return window.map.getBounds();
if(window._storedPaddedBounds) return window._storedPaddedBounds;
var p = window.map.getBounds().pad(VIEWPORT_PAD_RATIO);
@ -124,10 +125,16 @@ window.getPaddedBounds = function() {
return p;
}
window.renderLimitReached = function() {
if(Object.keys(portals).length >= MAX_DRAWN_PORTALS) return true;
if(Object.keys(links).length >= MAX_DRAWN_LINKS) return true;
if(Object.keys(fields).length >= MAX_DRAWN_FIELDS) return true;
// returns true if the render limit has been reached. The default ratio
// is 1, which means it will tell you if there are more items drawn than
// acceptable. A value of 0.9 will tell you if 90% of the amount of
// acceptable entities have been drawn. You can use this to heuristi-
// cally detect if the render limit will be hit.
window.renderLimitReached = function(ratio) {
ratio = ratio || 1;
if(Object.keys(portals).length*ratio >= MAX_DRAWN_PORTALS) return true;
if(Object.keys(links).length*ratio >= MAX_DRAWN_LINKS) return true;
if(Object.keys(fields).length*ratio >= MAX_DRAWN_FIELDS) return true;
return false;
}